Enterprise Java Backend with Spring Framework & Spring Boot: From First Principles to Production

Course Overview

This comprehensive guide explores the architecture and implementation of enterprise Java applications using Spring Framework and Spring Boot. Built on first-thought engineering principles, this course demystifies the magic behind Spring Core, dependency injection, request dispatching, relational data mapping, and production security.

Beginning with foundational client-server mechanics, Servlets, and Maven build lifecycles, you will transition into advanced architectural patterns including Aspect-Oriented Programming (AOP), persistence context internals, transaction propagation, stateless JWT authentication, and automated testing with Mockito and MockMvc.

What You'll Learn

• Spring Core & IoC Mechanics: Deep dive into ApplicationContext, Bean definitions, lifecycle hooks (@PostConstruct, @PreDestroy), bean scopes, and circular dependency resolution.
• Spring Boot Internals: Understand how @SpringBootApplication, conditional auto-configuration (@ConditionalOnClass, @ConditionalOnMissingBean), and starter POMs eliminate boilerplate configuration.
• Modern RESTful API Engineering: Construct robust endpoints utilizing DispatcherServlet, custom DTOs, Jakarta Bean Validations, and centralized @RestControllerAdvice error handling.
• Request Interception & AOP: Implement custom Filter chains, HandlerInterceptor pipelines, and Aspect-Oriented Programming advice (@Around, @Before, @AfterReturning) backed by dynamic JDK and CGLIB proxies.
• Data Persistence & ORM: Traverse the data tier from raw JDBC and JdbcTemplate to Hibernate ORM, entity states, mapping relationships (@OneToMany, @ManyToOne), eliminating the N+1 problem with @EntityGraph, and dynamic queries in JpaRepository.
• ACID Transactions: Control transactional boundaries, isolation levels (dirty reads, non-repeatable reads, phantom reads), and propagation rules (REQUIRED, REQUIRES_NEW).
• Enterprise Security & Identity: Configure SecurityFilterChain, custom UserDetailsService, password hashing with BCrypt, stateless JWT issuance/validation, and OAuth 2.0 / OpenID Connect Google social login.
• Automated Testing & Production Design: Write rock-solid tests across the testing pyramid using JUnit 5, Mockito stubbing, MockMvc web slice testing, and @DataJpaTest.

Prerequisites

• Strong foundations in core Java (OOP concepts, interfaces, collections, exceptions, and basic reflection).
• Basic knowledge of relational database concepts and SQL queries.
• Familiarity with HTTP communication, status codes, and JSON data exchange.

Tools & Technologies

• Language & Runtime: Java (JDK 17/21)
• Frameworks & Libraries: Spring Framework, Spring Boot, Spring Security, Spring Data JPA, Hibernate
• Build & Dependency Management: Apache Maven (pom.xml)
• Databases: MySQL, H2 in-memory database
• Testing: JUnit 5, Mockito, MockMvc
• Utilities & Tooling: Postman, DBeaver, Nimbus JOSE+JWT